Baking soda is not only used as a baking agent. It also has its other uses, and one of those is as an acting agent for stain removal.
Among the stains that can be removed by baking soda are blood, sweat, vomit, and fruit/wine stains.
This article over at About.com has some tips on how to remove the abovementioned stains. Check them out now.
Link: Baking Soda and Stain Removal Using Baking Soda for Stain Removal